Delete spezific Xml Node in c#

As i said in the Title: I'm trying to delete a Spezific XML node(in c#).

so i researched and found this:

XmlDocument xmlDoc = new XmlDocument();
XmlNode nodeToDelete = xmlDoc.SelectSingleNode("/root/XMLFileName[@ID="+nodeId+"]");
        if (nodeToDelete != null)
        {
            nodeToDelete.ParentNode.RemoveChild(nodeToDelete);
        }
        xmlDoc.Save("XMLFileName.xml")

by Johnny

and i understand here that he's tergeting a speziffic node ( in this case "[@ID ="+nodeId+)

Ok, my question is can i do the same just in the opposite way, by that i mean if its not nodeId then delete it (just like the "!="-Operator in C#).

If i understood something wrong pls type it in the commends :) constructive criticism is welcome :)